Air-compressor for internal-combustion engines.



H. LEMP. AIR COMPRESSOR FOR IN TERNAL COMBUSTION ENGINES.

HLED DEC. 26 I 91 a.

Patented wrucmm Aug. 7,191.7.

,w x .C. v X x 5 4 Inventor:

Hek-rnann Lamp,

Hus ttorne y Wihnesses: 1

I tion Engines 7 'gines of 40 crank eliambenairgmnst flow first stageDDSGG QV GlTgHIg pump portlon l a vention is shown a STATES PA ENToFFIoE.

01'" ERIE, PENNSYLVANIA.- ASSIGNOR T0 GENERAL COMPANY, A eonrolm'r on onNEW YGRK.

ELECTRIC tlnl nqonignnsson non INTERNAL-COMBUSTION ENGINES.

S pecificntion of Letters Patent.

Patented Aug. 7, 19 17 np nwaonmed December 26,1618. summat ons.

m Air-G0mpressors f'o Internal-Combussbeoi-fi'oation:

9 :111 the "operationof mternal combustion s it is desirahle to maintainthe'eran'ke I unrler a ight fwtci uin "to prerent th' ,ilibi -ieet.- il-thereinfrom" rough this hints and? also to r. eve an xhimst he pistotiri-ngn into said chamber. Some eng nes;- notably 00m ression' cycle arerovided 'wit e01 J,-

rum-ting air; compressors for supplying low 20 pressurean'for"soaven'gmg purposes, and

hi h

glans-tier! chamber agai 11st th e compression prssam; Generallyspoaking'the first sthe 'xe of jsueh a compressor is referred to as;

Iiniineistruetnre, but it is usually done for snnplvm ty and mineralcost. Mly llfl'lltlOII-JS directed especially to. en

ih' object to ing prove'their eonstruotion and operation} whereby theSaid compressor, 1n

addition-to supplying the scavenging; and

fuel injecting or blast air, as itis commonly 85 oallethis utilized tomaintain a slight vacuum- 'in'the'rank'olnunher. Tlo' prevent the norm'"presea -sueld'ng oilout )f -the crank chamber when so arranged, tinoilseparator is lqcatlsd in the conduit through which the on'it We) tothe ofthe dornpressor.

In the aocm'n'panyin drawing. Whi'eh ill'ns trates one of theenihodiments of my inportion of an engine provided with a reciprocatingair cornprt-sasor,

'severail iof'the pantq lindicates thei b contains'n closed crank ior,actuating the air compressor means otthe connecting ontop of the hasteor rzinla" casing ceiver 6 of any suitable construction. L0

5 haveAinyentext-hewaml1 'efullmpi'ovementsh pressure :ai'r forinjeeting fuel 'intothe;

glng r pnm psx ltisnot necessary .of' i to build the painp andcompressor the last n'lentioneti typehnd has for.

a flange at its upper endQith" on the top of the receiver,

beln sh wn me sectiorn. aae o, the engine which chamber 2. Bindiv v 60cates themain sh-nift of the engine havinggg l cated in the receiver isa reniprocating air compressor shown in dotted" lines. It co1n= prises alow pressure portion 7, commoniy referred to asft-he scavenging pump,an. in-

.termodiate pressure pertainv 8, and awhi hi pressure portion B thelat'ter suppli iiig t1e blast hair for injeotingfuel into ;t e coinbustion chambers of the working cylinders. The pieton 7 end, thecylinder of the seavenging'pump are both indicated by dotted lines;Tl'he scavengmgpump is of a' double acting type. While the intermediateand high pr ssure portions of the compressor aresin gle acting. Theadmission ofair to the scavenging pump and the (hseharge therefrom intothe receiver is (rontrolledjby the reeiproeating valve 10, the latterbeing ac-' 'tuated hysnitable means from themain. shalftfi. Themainsupply of air to the scavenging pump is admitted to chamber ll;thmngh the screen 1.2 which is mounted directly above; Tn order to maintam a slight vacunm in the crank chamber to prevent luln'i'rant frombeing i foreed tin-(n gh the various joints and alsoto'c-arry off anyexhaust gasos'which may leak intothe crank Qehambex" past the pistonrings, a

conduit 13 is provided in the "s mp y the receiver oielsewhere whichopens at its'luwer end into the crank chamber, other end opening intothe snpplyehamber 11; Owing to the movements of. the various ,oranl'cs:in the crank chamber the lubricating oil is agitated and any deucesucking air out of'the chamher is liable to oarry with it more or lessluhrieant inv the form ofismall partieles or spray; To prevent this fromentering the scavenging pump gafar asypossiblm an oil This eepnmtor thevertical conduit, 13.- v comprises a casing 1.4 which is qmgided with,Loc'itted inside of the oasingjiiim tube 15 the upper end ofwhieh'isinto one endof the condnit '16, s'hid conduitforminga-eontinuatio'n ofthe" eondhitlKfind openin into the air snpplythafh.frll. The mile of the aped as to form a. Venthri "of which is formed byV 1 through which air mixed with a certain amount of luhrlcant is freee'eiiigl-land the tube 15. oftthecasing s provided separator 15ynIovidetl which is loeatedyin fitter restini to flow on the suctionstrokes of the piston of the scavenging pump. Owing to the fact thattube15 is only open at its lower end,

the flow ofair passing through the orifices 18 has to change from anupward to a downward direction, and in passing through the throat 17 ofthe Venturi tube its velocity is largely increased. This causcstheparticles of oil to be projected downward against the inclined lowerwall 19 of the rasmg. In the wall is a small orifice 20 through whichthe lubricant is free to drop back into the conduit 13 and chamber Dueto the fact that this orifice small in cross seetioi i, the tendencyforj air to flow through it in an upward direction can be disregarded.After theairhas passed through the separator; it' flows .through theconduit 16 and there unites with the fresh air flowing through thesereei'i- 12 into the supply chamber. In other words, the screen andconduit 16 are arranged in multiple to supply air to' the scavengingpump, the greater portion of the air, however, being received throughthe screen By properly proportioning the cross sectional area of theconduit 16 and the inletarea of the chamber 11 'flOlll the screen. anydesired vacuum can be maintained in the crank chamber 2., Generallyspeaking only a com- ]niratively slight vacuum is necessary in thechamber 2 to prevent lubricant from Working out through the variousjoints inthe crank casing.

thereto since it can bejutilized-With fourl have shown my 'invention inconnection with a two-cycle engine but it is not'limited cycle enginesin which case'the working pisions will have the function on theirsuction strokes as vthe piston. 7.

In accordance with the provisions of the patent statutes I havedescribed the principle of operation of my invention, together writh theapparatuszwhich I now consider to represent the best embodiment thereof;but I desire to have it understood that the apparatus shown is onlyillustrative, and

other means.

\Vhat I claim as new and desire to secure by Letters Patent of theUnited States 1. In an apparatus of the character described, thecombination of an internal oombustion engine having a closed crnn'k caoing containing lubricant for the an int an air compressor driven by theengine and supplying air to it. said compressor having an air inlet anda valve contro to the inlet of the compressor at a int in advance ofsaid valve as regnrds t e flow of air, said com ressor receiving air inparallcl through said inlet and the conduit leading from the crank casiwhereby said compressor serves to wit draw I explosive from the crankcasing and to maintain a slight vacuum therein to prevent the leakage oflubricant.

2. In an apparatus of the character described, the combination of aninternal comling the some, and a conduit connecting the crank casingthat the invention can be carried out by oustioncngine having a closedcrank casing containing lubricant for the engmeyan air compressor drivenby the engine and Supplying air to it, said compressor having an airinlet and evolve controlling the same,

' a conduit connecting the crank casing to the inlet of the compressorat a point in advance of said valve. its regards the flow of air, said;

compressor receiving air in parallel throu b said inlet and the conduitleading from t e crank casing, whereby said compressor serves towithdraw explosive gases from the crank casing and to maintain a slightday' of December, 1913, D0

